Mettler Toledo M400 Specifikace Strana 70

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Transmitter M400 70
© 02 / 2010 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter M400
Printed in Switzerland 52 121 378
8.2.3.2 pH/ORP parameters
If during the channel setup (see chapter 8.2.1 “Channel setup”) the parameter pH/ORP has been
chosen or an pH sensor based on ISM technology is connected to the transmitter, the parame-
ters drift control, buffer recognition, STC, IP, fixed Calibration temperature and the displayed units
for slope and zero point can be set resp. adjusted.
For doing this adjustments resp. settings the menu “pH”, that will be displayed, has to be cho-
sen. (see chapter 8.2.3 “Parameter related settings”).
Select the drift control for calibration as Auto (drift and time criteria have to be fulfilled) or man-
ual (The user can decide when a signal is stable enough to complete calibration)
followed by the relevant buffer table for the automatic buffer recognition. If the drift rate is less
than 0.4 mV over a 19 second interval then the reading is stable and the calibration is done us-
ing the last reading. If the drift criteria is not met within 300 seconds then the calibration times
out and the message ”Calibration Not Done” Press ENTER Enter to ”Exit” is displayed.
Press [ENTER]
For automatic buffer recognition during calibration, select the buffer solution set that will be
used: Mettler-9, Mettler-10, NIST Tech, NIST Std = JIS Std, HACH, CIBA, MERCK, WTW or None.
See Section 19 “Buffer tables” for buffer values. If the auto buffer feature will not be used or if the
available buffers are different from those above, select None. Press [ENTER].
STC is the solution temperature coefficient in units of pH / °C referenced to 25 °C (Default =
0.000 for most applications). For pure waters, a setting of 0.016 pH / °C should be used. For
low conductivity power plant samples near 9 pH, a setting of 0.033 pH / °C should be used.
These positive coefficients compensate for the negative temperature influence on the pH of these
samples. Press [ENTER].
IP is the isothermal point value (Default = 7.000 for most applications). For specific compensa-
tion requirements or non standard inner buffer value, this value can be changed. Press [ENTER].
The option to enter a fixed calibration temperature is given. ”Fixed” allows a specific tempera-
ture value to be entered. Selecting ”No” means the temperature configured under 8.2.2 will be
used for the calibration. Press [ENTER].
The units for the slope and the zero point, that will be shown on the display can be chosen. The
default setting for the unit of the slope is [%] and can be changed to [pH/mV]. For the zero
point the default setting of the unit is [pH] and can be changed to [mV]. Use the c key to move
to the input field and select the unit by using the or . key.
Pressing [ENTER] again will bring up the Save Changes dialog. Selecting No will discard the
entered values and return to the measurement display screen, selecting Yes will save changes
made.
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